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From:
Friedrich Wilhelm Heinrich Alexander (Alexander) von Humboldt
To:
Charles Robert Darwin
Date:
18 Sept 1839
Source of text:
DAR 204: 180
Summary:

Praises CD’s Journal of researches and comments on some of CD’s observations and conclusions. Considers volcanic activity and its effect on past climate and changes in climate over time. Discusses glacial phenomena. Believes the climate of the coast of Peru is modified by cold sea-currents.

Contributor:
Darwin Correspondence Project
From:
Charles Robert Darwin
To:
Friedrich Wilhelm Heinrich Alexander (Alexander) von Humboldt
Date:
1 Nov 1839
Source of text:
Staatsbibliothek zu Berlin – Preußischer Kulturbesitz (Nachl. Alexander von Humboldt, gr. Kasten 4, Nr. 22, Bl. 1–2)
Summary:

Gratified by AvH’s letter.

Sends data on temperature of the sea in the Galapagos, South Pacific, and the Abrolhos Islands.

Contributor:
Darwin Correspondence Project
From:
Alexander von Humboldt
To:
Mary Somerville
Date:
12 Jul 1849
Source of text:
MSH 6 / 355, Dep. c. 370, Bod, MS
Summary:

No summary available.

Contributor:
Brigitte Stenhouse
From:
Alexander von Humboldt
To:
Sir John Herschel
Date:
[8 October 1828]
Source of text:
RS:HS 10.63
Summary:

Requesting the opinion of JH's late father on the nebulae in Orion.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Alexander von Humboldt
Date:
[18 March 1829]
Source of text:
RS:HS 21.43
Summary:

In response to AH's 1828-10-8, JH writes to tell him of William Herschel's ideas on nebulae and the Magellanic Clouds.

Contributor:
John Herschel Project
From:
Alexander von Humboldt
To:
Sir John Herschel
Date:
[29 May 1838]
Source of text:
RS:HS 10.64
Summary:

Calling his attention to the works of J. C. Poggendorf and Guillaume Weber. Does he know of the ingenious work carried out at the Cape by C. F. Gauss and Weber?

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Alexander von Humboldt
Date:
[31 July 1838]
Source of text:
RS:HS 10.65 & 21.255
Summary:

Regrets he was unable to meet him when in Hanover. Took no part in Guillaume Weber's operations at the Cape, but has become acquainted with them through Weber's volumes. Has pressed the Admiralty on the necessity of Magnetic Observatories at various places. Regarding AH's observations on the barometer.

Contributor:
John Herschel Project
From:
Alexander von Humboldt
To:
Sir John Herschel
Date:
[19 August 1842]
Source of text:
RS:HS 10.66
Summary:

Recounts details of his recent visit to England. Recent astronomical observations. Has JH heard from C. K. J. Bunsen about his award?

Contributor:
John Herschel Project
From:
Alexander von Humboldt
To:
Sir John Herschel
Date:
[18 April 1844]
Source of text:
RS:HS 10.67
Summary:

Sending a letter via Ca'colia Gibson raising various queries regarding nebulae.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Alexander von Humboldt
Date:
1844-6-10 or [1844-5
Source of text:
RS:HS 22.197
Summary:

Extensive letter answering the many queries about nebulae raised by AH in his 1844-4-18 [letter contains notes made by AH].

Contributor:
John Herschel Project
From:
Alexander von Humboldt
To:
Sir John Herschel
Date:
[8 June 1845]
Source of text:
RS:HS 10.68
Summary:

Sending the first volume of Kosmos. Queries regarding the Magellanic Clouds.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Alexander von Humboldt
Date:
[2 November 1845]
Source of text:
RS:HS 22.253
Summary:

Sends thanks and very high praise for AH's first volume of Kosmos. Also comments on a number of other astronomical matters.

Contributor:
John Herschel Project
From:
Alexander von Humboldt
To:
Sir John Herschel
Date:
[19 January 1850]
Source of text:
RS:HS 10.69
Summary:

Queries regarding JH's star lists. Sending magnetic information from A. T. Kupffer. Regarding the distribution of nebulae.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Alexander von Humboldt
Date:
[11 February 1850]
Source of text:
RS:HS 23.84
Summary:

Answers questions raised by AH in his 1850-1-19 [letter contains notes made by AH].

Contributor:
John Herschel Project
From:
Alexander von Humboldt
To:
Sir John Herschel
Date:
[11 August 1850]
Source of text:
RS:HS 10.71
Summary:

Is grateful for his constructive letter on the Coal Sack. Regarding the work of the Schlaginweit brothers.

Contributor:
John Herschel Project
From:
Alexander von Humboldt
To:
Sir John Herschel
Date:
[31 December 1850]
Source of text:
RS:HS 10.72
Summary:

News of the astronomical activities of his colleagues. Astronomical queries.

Contributor:
John Herschel Project
From:
Alexander von Humboldt
To:
Sir John Herschel
Date:
[13 August 1851]
Source of text:
RS:HS 10.73
Summary:

Introducing Adolphe Barth. Astronomical news and queries.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Alexander von Humboldt
Date:
[8 November 1851]
Source of text:
RS:HS 23.110
Summary:

JH has been delayed in replying to AH's 1851-8-13 because of official duties at the Great Exhibition. Comments further on several astronomical matters.

Contributor:
John Herschel Project
From:
Alexander von Humboldt
To:
Sir John Herschel
Date:
[6 May 1855]
Source of text:
RS:HS 10.74
Summary:

Sends a letter of praise for the family Herschel, including especially JH and his father, William.

Contributor:
John Herschel Project
From:
Sir John Herschel
To:
Alexander von Humboldt
Date:
[1842?]
Source of text:
RS:HS 10.75
Summary:

Convey his thanks to the King for the Order of Merit. Regrets he did not see the King or AH when they visited London recently. Gives astronomical information.

Contributor:
John Herschel Project